Github user cloud-fan commented on a diff in the pull request:

    https://github.com/apache/spark/pull/13909#discussion_r93792078
  
    --- Diff: 
sql/catalyst/src/main/scala/org/apache/spark/sql/catalyst/util/GenericArrayData.scala
 ---
    @@ -71,6 +71,10 @@ class GenericArrayData(val array: Array[Any]) extends 
ArrayData {
       override def getArray(ordinal: Int): ArrayData = getAs(ordinal)
       override def getMap(ordinal: Int): MapData = getAs(ordinal)
     
    +  override def setNullAt(ordinal: Int): Unit = throw new 
UnsupportedOperationException();
    --- End diff --
    
    it's pretty easy to implement it: `array(ordinal) = null`, why throw 
exception here?


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